参数资料
型号: ST72F652R4T1
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP64
封装: 14 X 14 MM, TQFP-64
文件页数: 120/160页
文件大小: 974K
代理商: ST72F652R4T1
ST7265
62/160
11.3 USB INTERFACE (USB)
11.3.1 Introduction
The USB Interface implements a full-speed func-
tion interface between the USB and the ST7 mi-
crocontroller. It is a highly integrated circuit which
includes the transceiver, 3.3 voltage regulator, SIE
and USB Data Buffer interface. No external com-
ponents are needed apart from the external pull-
up on USBDP for full speed recognition by the
USB host.
11.3.2 Main Features
s
USB Specification Version 1.1 Compliant
s
Supports Full-Speed USB Protocol
s
Five Endpoints (including default endpoint)
s
CRC
generation/checking,
NRZI
encoding/
decoding and bit-stuffing
s
USB Suspend/Resume operations
s
Special Data transfer mode with USB Data
Buffer Memory (2 x 512 bytes for upload or
download) to DTC
s
On-Chip 3.3V Regulator
s
On-Chip USB Transceiver
11.3.3 Functional Description
The block diagram in Figure , gives an overview of
the USB interface hardware.
For general information on the USB, refer to the
“Universal Serial Bus Specifications” document
available at http//:www.usb.org.
Serial Interface Engine
The SIE (Serial Interface Engine) interfaces with
the USB, via the transceiver.
The SIE processes tokens, handles data transmis-
sion/reception, and handshaking as required by
the USB standard. It also performs frame format-
ting, including CRC generation and checking.
Endpoints
The Endpoint registers indicate if the microcontrol-
ler is ready to transmit/receive, and how many
bytes need to be transmitted.
Data Transfer to/from USB Data Buffer Memory
When a token for a valid Endpoint is recognized by
the USB interface, the related data transfer takes
place to/from the USB data buffer. In normal con-
figuration (MOD[1:0] bits=00 in the CTLR register),
at the end of the transaction, an interrupt is gener-
ated.
Interrupts
By reading the Interrupt Status register, applica-
tion software can know which USB event has oc-
curred.
Figure 38. USB Block Diagram
CPU
Transceiver
3.3V
Voltage
Regulator
SIE
ENDPOINT
BUFFER
USB
Address,
and interrupts
USBDM
USBDP
USBVCC
48 MHz
REGISTERS
data busses
USBGND
BUFFER
USB
DATA
INTERFACE
1
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